weird!

[hglouis]

so i went to fire up the ole girl (76 FJ40) the other day when I realized the battery was drained. went to jump it , but still wouldn't ignite. popped off the air cleaner to look into the stock carb and lo and behold the barrel closest to me (drivers side) was near FULL of gas and was dripping gas into the barrel briskly. (it had not been run previously that day)

i have no elec fuel pump or other mechanism that would cause it to drip fuel into the barrel.

once i cranked the engine a few times, the pond of gas disappeared and it blew lots of white smoke and wouldn't stay running for more than 5 sec. then i realized that my fuel pump area was dumping tons of gas.

does this sound familiar to anyone? it was running great 2 days ago!

guess i'll start by replacing the fuel pump and battery.

thanks!

H

 

[TLCHopII]

Carb stuck float?
Pump bad diaphram?
flooding the carb with a severe fuel leak at the pump seems to be highly "unlikley".
Had mine 'pump' fuel out of the filler vent in large quantities when my tank vent became clogged. Perhaps this is the source of pressure for the float bowl/pump leaks? Was the rig parked in a decidedly nose down posture?

 

[TLCHopII]

sorry my last didn't make a whole lot of sense.
The tank vent was clogged and fuel filler cap gasket leak.

 

[dargreg]

If you are leaking raw fuel into the cylinders ,It is probably going past the rings into the oil pan. Check your oil for gas contamination .As for the reason I can only sudjest the pluged vent with a stuck float bowl.

 

[D'Animal]

You may want to pull the spark plugs and crank it over to get any fuel out of the combustion chamber.

You do not want to hydrolock your engine.

 

[hglouis]

thanks for all the suggestions,

will check the oil for gas,
check the breather line,
and install a new fuel pump.


more to come,

H

 

[hglouis]

ok,

new development - was out of town for a week fishing, and thought i'd look one more time closely to see where and what was hemorrhaging from under the truck.

so i had a friend fire the truck up (no gas in the barrell after sitting for a week) and watched closely (with a fire extinguisher) and wow,

gas was pouring (i mean pouring) out of what looked like two factory holes in the side of the fuel pump (passenger side).

so what does that mean? is this an overflow mechanism or.???..need help here.

new fuel pump should be here today or monday.

thanks for suggestions, anyone else ever hemorrhage fuel from two holes in the side of the pump before?

 

[hglouis]

just figured it out - bad diaphragm

"The fuel pumps have 2 failure modes. A cracked diaphragm is the obvious one, because the pump will leak fuel rather than pump.
The other failure is the valve discs get scratched from passing dirty fuel and they will no longer make a good enough seal to move fuel. The only way to know for sure if this is a problem is to pull vacuum on the valves and see if they will hold vacuum for several seconds.

But if the pump arm is moved and fuel is not pumped, the pump is bad, regardless of root cause."


thanks jim c from the archives.

H